A rollercoaster cart with a mass of 11 kg is travelling around a vertical loop (circle) with a radius of 8 meters. At the top, it's traveling at the minimum speed needed so that it remains in contact with the track. If at some short time later it is at the side of the loop (halfway between the top and bottom), what is the normal force on the cart, in Newtons, if it loses 147 Joules of work to non-conservative forces (friction) as it traveled to the side of the loop?
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